Cut resistant paper and paper articles and method for making same
View Patent ↗The specification discloses a method for making a paper material having a reduced tendency to cut human skin. The method includes providing a papermaking furnish containing cellulosic fibers and from about 0.5 to about 5.0 wt % by weight dry basis expandable microspheres, forming a paperboard web from the papermaking furnish, drying the web, and calendaring the web to a caliper of from about 11.0 to about 18.0 mils and a density ranging from about 7.0 to about 12.0 lb/3000 ft 2 /mil. Papers formed according to the method and articles formed therefrom are also disclosed.
1. A paper substrate, comprising cellulosic fibers and from 0.5 to 5.0 wt % of microspheres based upon the total weight of the substrate on a dry basis, wherein said substrate has a density of from 7.0 to 12.0 lb/3000 ft 2 /mil and reverse die cut edges which exhibit improved resistance to inflicting cuts upon human skin.
2. The paper substrate according to claim 1 , wherein the microspheres comprises synthetic polymeric microspheres.
3. The paper substrate according to claim 1 , wherein the expanded microspheres are made from at least one material selected from the group consisting of methyl methacrylate, ortho-chlorostyrene, polyortho-chiorostyrene, polyvinylbenzyl chloride, acrylonitrile, vinylidene chloride, para-tert-butyl styrene, vinyl acetate, butyl acrylate, styrene, methacrylic acid, and vinylbeazyl chloride.
4. The paper substrate according to claim 1 , wherein the fibers comprise at least 30 wt % softwood fibers by weight dry basis.
5. The paper substrate according to claim 1 , wherein the fibers comprise not morc than 70 wt % hardwood fibers by weight dry basis.
6. The paper substrate according to claim 1 , wherein said substrate has a Cutting Index of less than 40 when analyzed according to the Cutting Index 30 test.
7. The paper substrate according to claim 1 , wherein said miorospheres are expanded, unexpanded, or mixtures thereof.
8. The paper substrate according to claim 1 , wherein said microspheres comprise at least one volatile fluid.
9. The paper substrate according to claim 1 , wherein said microspheres are dispersed within the cellulosic fibers.
10. The paper substrate according to claim 1 , wherein the substrate is a folder or jacket.
11. The paper substrate according to claim 1 , wherein the substrate is calendared.
12. The paper substrate aocordihg to claim 1 , wherein said substrate has a caliper of from 11.0 to 18.0.
13. A method of making the paper substrate according to claim 1 , comprising contacting said cellulosic fibers with said microspheres.
14. The method according to claim 13 , comprising contacting said cellulosic fibers wit said microspheres at prior to a headbox of a papermaking machine.
15. The method according to claim 13 , wherein the microspheres are expanded, unexpanded, or mixtures thereof.
16. The method according to claim 13 , further comprising drying said substrate.
17. The method according to claim 13 , further comprising calendaring said substrate.
18. A paper substrate, comprising cellulosic fibers and from 0.5 to 5.0 wt % of microspheres based upon the total weight of the substrate on a dry basis, wherein said substrate has a caliper of from 11.0 to 18.0 and reverse die cut edges which exhibit improved resistance to inflicting cuts upon human skin.
19. The paper substrate according to claim 18 , wherein the microspheres comprises synthetic polymeric microspheres.
20. The paper substrate according to claim 18 , wherein the expanded microspheres are made from at least one material selected from the group consisting of methyl methacrylate, ortho-chlorostyrene, polyortho-chiorostyrene, polyvinylbenzyl chloride, acrylonitrile, vinylidene chloride, para-tert-butyl styrene, vinyl acetate, butyl acrylate, styrene, methacrylic acid, and vinylbenzyl chloride.
21. The paper substrate according to claim 18 , wherein the fibers comprise at least 30 wt % softwood fibers by weight dry basis.
22. The paper substrate according to claim 18 , wherein the fibers comprise not more than 70 wt % hardwood fibers by weight dry basis.
23. The paper substrate according to claim 18 , wherein said substrate has a Cutting Index of less than 40 when analyzed according to the Cutting Index 30 test
24. The paper substrate according to claim 18 , wherein said microspheres are expanded, unexpanded, or mixtures thereof.
25. The paper substrate according to claim 18 , wherein said microspheres comprise at least one volatile fluid.
26. The paper substrate according to claim 18 , wherein said microspheres are dispersed within the cellulosic fibers.
27. The paper substrate according to claim 18 , wherein the substrate is a folder or jacket.
28. The paper substrate according to claim 18 , wherein the substrate is calendared.
29. The paper substrate according to claim 18 , wherein the substrate has a density of from 7.0 to 12.0 lb/3000ft 2 mil.
30. A method of making the paper substrate according to claim 18 , comprising contacting said cellulosic fibers with said microspheres.
31. The method according to claim 30 ,comprising contacting said cellulosic fibers with said microspheres at prior to a headbox of a papermaking machine.
32. The method according to claim 30 , wherein the microspheres are expanded, unexpanded, or mixtures thereof.
33. The method according to claim 30 , further comprising drying said substrate.
34. The method according to claim 30 , comprising calendaring said substrate.